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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035b634bb14c2e82e700e9021215aecfa7c13856118a7e885cb3791354b084a3' 
  AND token = 'iWYlTPI7lT5wHx4kNCNy9r+CONTyQGxjRc0aMTn1SXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}